title: Multiplexed detection of xylene and trichloroethylene in water by photonic crystal absorption spectroscopy.
abstract: We experimentally demonstrate simultaneous selective detection of xylene and trichloroethylene (TCE) using multiplexed photonic crystal waveguides (PCWs) by near-infrared optical absorption spectroscopy on a chip. Based on the slow light effect of photonic crystal structure, the sensitivity of our device is enhanced to 1 ppb (v/v) for xylene and 10 ppb (v/v) for TCE in water. Multiplexing is enabled by multimode interference power splitters and Y-combiners that integrate multiple PCWs on a silicon chip in a silicon-on-insulator platform.
authors.forename: Wei-Cheng
authors.initials: WC
authors.lastname: Lai
authors.forename: Swapnajit
authors.initials: S
authors.lastname: Chakravarty
authors.forename: Yi
authors.initials: Y
authors.lastname: Zou
authors.forename: Ray T
authors.initials: RT
authors.lastname: Chen